Extension light-bracket



(No Model.)

Inventor.

UNITED STATES PATENT Fries.

PETER G. BROVN, OF SOHENEOTADY, ASSIGNUR Oi" UN lG'l l l.l TU llldllthlll'l T. DO\VNIN(l, OF ALPANY, NEW YORK.

EXTENSION LIGHT-BRACKET.

SPECIFICATION forming part of Letters Patent No. 306,576, dated October 14,1884.

Application tiled March 10, 1834. (No inodcl.)

Brackets, of which the following isa full, clear,

and exact description.

My invention relates to improvements in devicts for automatically holding and sustaining swinging lights from the ceiling ofa room;

and it consists of the novel arrangement and combination of parts hereinafter described, and specifically set forth in the claims.

Reference being had to the accompanying drawings, wherein like letters indicate like parts, Figure 1 represents a plan view of my invention, portions thereof being shown in dotted lines or broken away, so as to disclose the interior disposition of the parts. Fig. 2 is a vertical central section of the same, and Fig. 3 is a detail plan view of the base and locking plates, with their attachments. Fig. 4 is an enlarged sectional view of one of the frictionrollers and its regulating-screw.

2 Referring to the several figures and the desi gnating-letters marked thereon, Arcpresents the room-cei ling, to which is afiixed, by screws passing through screw-holes D D or otherwise, the basc-p1ate B. This plate is preferably of circular contour, and carries four stud-pins, G

C G U, arranged at equal distances from each other and projecting downwardly. It also bears stanchions E E, in which are jourualed, respectively, grooved friction-rollers F F, whose freedom of rotation is regulated by means of the headed screws u a. Centrally the plate B is provided witha stud, Y, having an enlarged basal boss, and terminating in a screw-threaded extension for the reception of 0 the nut S. A plate, H, provided with rectangular circumferential notches, fits over the boss of the stud Y and bears on its under surface a pin, V. Upon one of the stanchions, as E, of the base-plate is attached the spring G, suitably bent for engagement with the notches of plate H. A spring-washer, f, rests upon plate H and the boss of the stud Y. A flanged disk, N, provided with a central hollow sleeve, fits over the stud Y and rests by its flange upon the plate H. It carries anmc lar flanges I Q R, between which are wound rm b in opposite directions the cords Til M, passing, respectively, over the opposil e friction-rollers 11 F. The surface of the disk has a slotted guide for the reception of the pin \V, attached to the slide T. The ccnlral sleeve is provided with a stud, X, upon which is hooked the inner end of the coiled baud-spring, L, thcouter end of which is attached to the stud The cords M M are passed through urrforationsin a ring, 0, which constitutes the upper partol' the bracketfrmne of the lamp, and is designed and adapted to rest upon the upper flange of the shade, springlmoks Z Z Z extending over the latter and holding it in place.

The parts being disposed as described, the operation of my invention is as follows: The spring (l engaging with one ofthe notches of the plate 11, the proper degree of tension is secured for the spring Lby revolving the disk N. The slide T is then moved inwardly, as shown in dotted lines. Fig. L, until the pin \Y is at the same distance from stud Y as is the pin V, and abuts against it. thus locking together the disk and plate and preventing the spring from nneoiling. The plate H and disk, with their attachments. arcihus free to revolve upon stud Y. llheeords M M" are accordingly lengthened or shortened byu nwinding or winding them, as the (use may be, until they are ofthe length desired for the lowest position of the lamp. The lamp is then placed within the bracket and the frici ion roller screws tightened or loosened until a sutlicient frictional contact is secured to insure equilibrium and maintain the light at any point against the action of the spring to which it may be desired to elevate it by the hand. The slide '1 is, then pushed back and the spring allowed to act.

hen, by reason of accident or otherwise, it is desired to substitute temporarily for the lamp ordinarily in use another of greater or lesser weight, it is evident that without adjustment of the sustaining-cords the same play cannot be secured. tonseipicntly it is news sary to again lock the plate l[ and disk N together until the cords are shortened or lengthened to correspond with the difl'ercnce in weight. \Vhen the proper length of cord is secureddhc springisngain broughtinto action, as before.

Haring ilnisdeserihed my invention. what i i'iilllll, and desire to seenre by Letlers lntent, 1s

1. in an extension lightbmeket, the (0111- hinntion of the lump and its snst:tiningeords the spring-easing containing the coiled spring and provided with stainehions carrying rollers, and regnlnting-seren's for Varying the friction between said stnnehions and rollers, substantially as shown and described.

2. in an extension light-ln'nielurt, the coinhinntien oiihe plate ll, provided with eirennll'ereniizil non-hes, the holding-spring (l, the [lunged disk IN, and the eoiled spring L, substantially as shown and described.

3. In on extension light-braeket, the (0111- hinntion of the plate ll, provided with the stnds V and Y, the flanged disk having een trnl sleeve lilting over Y, the coiled spring L,

:lllziehed to V zind Y, 21nd the sliding pin W, substantially as shown and described.

4. In an extension light-bracket, the comhinzition 0f the plate If, provided with circumferential notches, the holding-spring G, the llnnged disk N, and the coiled spring L, snb- Sizllliiltii) as shown and described.

5. In an extension ligln-braeket, the 00m hinntion of the plate II and disk N with the intermediate swing-washer, f, substantially as shown and described.

In witness whereof I have hereunto set my hand in the presence of two subscribing Wit nesses.

llGlF (i. BROW'N. \Vitnesseu:

llnnnnnil T. DUWlYlNH, Jonn C. PENNHC. 

